00:01
So we're being asked to find the circumference.
00:04
The first thing we're going to do is get our formula for our circumference to pi r.
00:12
Then we're going to substitute after looking at our picture, the measurement of our radius.
00:23
I leave my two, i leave the pie, and my radius in this picture is four feet.
00:30
I'm putting the feet in there because we want to remember we need our units.
00:34
This is measurement.
00:37
And then we're going to give our exact answer, which means we're just going to clean this up to have the numbers multiplied and have pi by itself.
00:47
So that gives us our circumference of 8 pi feet.
00:53
Now, if you have pie in your calculator, when we do our approximation, you just press pi...